The invention provides an elastomeric expandable container having a first opening adapted to enable the introduction of a comestible fluid under pressure to inflate the same, and a second opening provided in a nipple-like projection extending from said container and adapted for nursing babies, said second opening being closed by valve means, and said valve means being opened and closed by the natural nursing actions of the baby to enable fluid to flow under pressure of the inflated container through said nipple and out of the opening thereof.